As the incident happened or a life event changed, human emotion/stress changed regularly. After a period of time, human emotion/stress gradually decreased in ideal condition. In the adverse conditions, long time accumulation of emotion/pressure will cause the decline in self-awareness which gives a great opportunity to make wrong judgments for their job. That lead to the potential risk may increase. In order to solve this problem, emotion/stress index help user manage their mental health which gives them risk prediction.

Principle of evaluation of fatigue/stress index

After the ECG/PPG data returned, we count the interval of the heart beats. The heart beats can calculate for HR and numbers of them can calculate HRV to analysis in time domain and frequency domain. Those values can give us reference of emotion/stress index.